Interacting Dark Energy Dynamical dark energy is expected to have interactions to the rest of the world besides the gravity Two types of couplings: direct derivative 1, direct coupling ling c l(yv, Fog Fp,Goog ng ·· 10-3e A Long range force M C<10(.Constrained tightly! S.M. Carroll, PRL(1998) B. Instability under quantum corrections Om≈ 10-ev>>m MMAA 4MDynamical dark energy is expected to have interactions to the rest of the world besides the gravity. Two types of couplings: direct & derivative 1, direct coupling Interacting Dark Energy ( , , ,...)       L F F G G M c m eV 33 10−   10 ( ) 4 M pl M c −  A. Long range force Constrained tightly! S.M. Carroll, PRL(1998) B. Instability under quantum corrections     eV m M m    −7 2 ~ 10 4 M M pl  ~ ew ~